The aluminum and plastic could be repurposed into constructing components. This process is designed more challenging when components are tightly layered, or are intensely contaminated. Pizza boxes with lots of grease might cause comparable challenges, given that the fats are struggling to be separated because of the hydrapulper operating at https://medium.com/@GabletopPak/gabletop-pak-source-for-premium-gable-top-cartons-and-containers-d8f1c375e041